Algorithm

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LeetCode Topics

Two Pointers

Problem Name	Difficulty
0026-remove-duplicates-from-sorted-array	Easy
0027-remove-element	Easy
0028-find-the-index-of-the-first-occurrence-in-a-string
0080-remove-duplicates-from-sorted-array-ii	Medium
0088-merge-sorted-array	Easy
0151-reverse-words-in-a-string	Medium

String

Problem Name	Difficulty
0006-zigzag-conversion	Medium
0013-roman-to-integer	Easy
0014-longest-common-prefix	Easy
0028-find-the-index-of-the-first-occurrence-in-a-string
0058-length-of-last-word	Easy
0151-reverse-words-in-a-string	Medium

String Matching

Problem Name	Difficulty
0028-find-the-index-of-the-first-occurrence-in-a-string

Array

Problem Name	Difficulty
0014-longest-common-prefix	Easy
0026-remove-duplicates-from-sorted-array	Easy
0027-remove-element	Easy
0080-remove-duplicates-from-sorted-array-ii	Medium
0088-merge-sorted-array	Easy
0121-best-time-to-buy-and-sell-stock	Easy
0134-gas-station	Medium
0169-majority-element	Easy
0238-product-of-array-except-self	Medium
0274-h-index	Medium
0380-insert-delete-getrandom-o1	Medium

Dynamic Programming

Problem Name	Difficulty
0121-best-time-to-buy-and-sell-stock	Easy

Sorting

Problem Name	Difficulty
0088-merge-sorted-array	Easy
0169-majority-element	Easy
0274-h-index	Medium

Hash Table

Problem Name	Difficulty
0013-roman-to-integer	Easy
0169-majority-element	Easy
0380-insert-delete-getrandom-o1	Medium

Divide and Conquer

Problem Name	Difficulty
0169-majority-element	Easy

Counting

Problem Name	Difficulty
0169-majority-element	Easy

Boyer–Moore Majority Vote Algorithm

Problem Name	Difficulty
0169-majority-element	Easy

Math

Problem Name	Difficulty
0013-roman-to-integer	Easy
0380-insert-delete-getrandom-o1	Medium

Trie

Problem Name	Difficulty
0014-longest-common-prefix	Easy

Counting Sort

Problem Name	Difficulty
0274-h-index	Medium

Prefix Sum

Problem Name	Difficulty
0238-product-of-array-except-self	Medium

Z Algorithm

Problem Name	Difficulty
0028-find-the-index-of-the-first-occurrence-in-a-string	Easy

Knuth–Morris–Pratt Algorithm

Problem Name	Difficulty
0028-find-the-index-of-the-first-occurrence-in-a-string	Easy

Boyer–Moore String-Search Algorithm

Problem Name	Difficulty
0028-find-the-index-of-the-first-occurrence-in-a-string	Easy

Design

Problem Name	Difficulty
0380-insert-delete-getrandom-o1	Medium

Randomized

Problem Name	Difficulty
0380-insert-delete-getrandom-o1	Medium

Greedy

Problem Name	Difficulty
0134-gas-station	Medium